Atkinson, Paul, author
Routledge, 1994
Buku Teks
Schusky, Ernest l.
Holt Rinehart and Winston, 1975
Buku Teks
Sands, Lionel
Vintage Press, 1978
Buku Teks
Redfield, Robert, author
Westview Press, 1991
Buku Teks
Marcus, George E.
The University of Chicago Press, 1986
Buku Teks